Joel's Hierarchical Subject Index

Meta-level Systems

Philosophy, Mathematics, Cybernetics, Library Science, Rhetoric, Education

Engineering and Technology

Agriculture, Forestry, Architecture, Material Science, Transportation, Computers, Construction

Human Interactions and Society

Business and Commerce, Law, Politics, Government, Sociology, Economics, Linguistics, Recreation, History, Geography-Humans on the Earth


Christianity, Judaism


Physics, Chemistry, Geology, Atmospherics, and Hydrology, Biology


Collections, Humans as Medium, Humans as Artist